Not that the most climbers don't know how to tie these knots, though very handsomely animated, but it's the uses they describe I find most informative. Besides knots to animate children (aka knots who resemble a butterfly or rabbit :)) like the double alpine butterfly) I have found uses for several knots I didn't knew about.
See (LINK TO SITE) and judge the site for yourselves.
And for the quick and smart 'knotters' the lightning way to tie a bowline:Or the One-handed Bowline animation (this LINK for animation):
(source: LinkedIn NKBV-group, animatedknots.com)